did both the PB and non PBrake cars have the booster relief in the driver side cover ?
tia

 

Hi Speedy, I was waiting to see if someone with more knowledge than me would chime in. I can tell you what I think, not what I know. Our '68 427/435 car came with no booster relief - it's a manual brake car. So, at least in '68, and in our case with a non-PB car, there was no relief. That said, I'm not certain about '69. And I'm also not certain that the factory, at that time, would have 100% consistency on this point. So, I'm not much help but do have an example from a late (Aug) build '68. Best, Paul

 

Thanks Hopper, my car was built Dec 4th of 68 and is a manual brake car, Im just trying learn this is my first Vette, I want to buy new V covers and not sure what to buy yet, looks like Cranes covers are the only US built repro's according to the interweb and their 550 bucks

 

there are 3 different covers,all have a different flat on the dr side rear corner

1.early was small or none
2.mid was a little more
3.late was largest

it went by production date

if i can find my NCRS book i'll post it

 

There were four different designs for 427 valve covers used during 1968 and 1969 production



The first design is a chromed carry over of the1967 427-valve cover with two clips on the intake side of the cover and a tapered rear. The driver's side valve cover has a large depression or crunched area on the lower rear corner for power brake booster clearance



The second design appeared around January 1968. On the passenger's side the L bracket is moved from its center position 3 inches backward to line up with the crankcase breather opening. On the driver's side, the large depression for the power brake canister is deleted and the end tapers evenly with a 60 0 slope from the intake to the exhaust side of the rear of the cover. To compensate for the taper, there is a thumb-size clearance bump next to the spark plug wire bracket. This allows for the continued use of the drip rail and contains the end of the drip rail and its projection weld. In addition, the two clips are removed from the intake side of the cover and as single clip appears on the exhaust side near the center of the valve cover. The clip is partially coated with black plastic material



The third design appeared around July 1969 and is identical to the second design except that the tall bent bracket with a tang that support the driver's side spark plug wires is moved forward about two inches, placing it forward of the rear intake attaching bolt



The fourth design appeared around December 1969. It is identical to the third design except that the clearance bump for the end of the dripper rail is removed. The projections of the dripper rail welds remain

 

Awesome info, thanks for the post...........would the single clip be for a temp sensor wire in the head or is it in the intake manifold

 

thanks for the input, looking at mine they are the correct OE ones for my car as you describe as the second design, and appears to have a throttle return spring tab on the dr side cover